Process for producing foundry sand molds

ABSTRACT

A foundry molding machine utilizing a match-plate and two sets of rubber lined cope and drag slip flasks with two stations; one station assembling one set of flasks with the match-plate therebetween and then rolling over the flask-match-plate assembly to fill the drag with sand while supporting the assembly on the cope and jolting and applying a low pressure preliminary squeeze to the sand within the drag, rolling the assembly back to fill the cope and then supporting the assembly on the sand within the drag for the application of jolt and high pressure squeeze to the sand in both the cope and drag, separating the assembly and indexing the cope and drag vertically separated to a second station while simultaneously indexing the second set of flasks to the first station, holding the sand rammed flasks vertically separated in the other station to permit coring and closing the flasks and stripping the sand cakes thus assembled therefrom to be placed on a bottom board while the second set of flasks are being filled and rammed at the first station; the indexing and roll-over of such flasks being obtained each by a piston-cylinder assembly having controlled stroke deceleration on extension thereof.

' United States Patent [191 Miller et al.

[ PROCESS FOR PRODUCING FOUNDRY SAND MOLDS [75] Inventors: Leon F.Miller, Rocky River; Henry J. Herbruggen, Westlake; Robert G. Shields,Chagrin Falls, all of Ohio Related US. Application Data [62] Division ofSer. No. 131,528, April 5, 1971, Pat. No. 3,815,662, which is a divisionof Ser. No. 672,063, Oct. 2, 1967, Pat. N0. 3,589,432. I

[52] US. Cl. 164/37 [51] Int. Cl. B22C 15/30 [58] Field of Search164/27, 29, 37, 38, 39,

[56] References Cited UNITED STATES PATENTS 1,561,500 11/1925 Wood164/29 2,013,278 9/1935 Luton 164/37 X 3,506,058 4/1970 Hunter 164/37Primary Examiner-Francis S. Husar Assistant Examiner John E. RoethelAttorney, Agent, or FirmDonnelly, Maky, Renner &

Otto TE F Nov. 4, 1975 ABSTRACT A foundry molding machine utilizing amatch-plate and two sets of rubber lined cope and drag slip flasks withtwo stations; one station assembling one set of flasks with thematch-plate therebetween and then rolling over the flask-match-plateassembly to fill the drag with sand while supporting the assembly on thecope and jolting and applying a low pressure preliminary squeeze to thesand within the drag, rolling the assembly back to fill the cope andthen supporting the assembly on the sand within the drag for theapplication of jolt and high pressure squeeze to the sand in both thecope and drag, separating the assembly and indexing the cope and dragvertically separated to a second station while simultaneously indexingthe second set of flasks to the first station, holding the sand rammedflasks vertically separated in the other station to permit coring andclosing the flasks and stripping the sand cakes thus assembled therefromto be placed on a bottom board while the second set of flasks are beingfilled and rammed at the first station; the indexing and roll-over ofsuch flasks being obtained each by a piston-cylinder assembly havingcontrolled stroke deceleration on extension thereof.

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1. A process for producing foundry sand molds comprising the steps ofassembling cope and drag flasks with a pattern therebetween, placing thedrag flask up and filling it with sand, preliminarily squeezing the sandtherein, then turning the assembly over and filling the cope flask withsand, squeezing such sand in both the cope and drag flasks, verticallyseparating the cope and drag flasks, and then laterally indexing suchflasks vertically separated for coring and closing.
 2. A process as setforth in claim 1 including the step of jolting the cope and drag flasksto facilitate the ramming of sand therein.
 3. A process as set forth inclaim 1 including the step of supporting peripherally the cope flask asthe drag flask is filled, and supporting the preliminarily squeezed sandcake within the drag flask as the cope flask is filled.
 4. A process asset forth in claim 1 wherein the assembly is turned over by theretraction and extension of a piston-cylinder assembly having controlleddeceleration on extension.
 5. A process for producing completed foundrysand molds comprising the steps of ramming cope and drag flasks with apattern therebetween at one station, vertically separating such flasksto draw the pattern therefrom, indexing such vertically separated flasksto a second station, holding such flasks vertically separated at suchsecond station to permit coring, and then closing such flasks andstripping the sand molds therefrom.
 6. A process as set forth in claim 5including two sets of cope and drag flasks, and indexing such setsalternately to and from the two stations.
 7. A process as set forth inclaim 5 including the step of indexing empty flasks into such onestation as the sand rammed flasks are indexed from such one station. 8.A process as set forth in claim 5 including the steps of placing thedrag flask up and filling it with sand at such one station,preliminarily squeezing the sand therein and then turning the assemblyover and filling the cope-flask with sand and then finally squeezingsuch sand in both the cope and drag flasks.
 9. A process as set forth inclaim 5 wherein the ramming of the cope and drag flasks is accomplishedby both high pressure squeeze and jolt.
 10. A process as set forth inclaim 5 including the step of placing a bottom board under the sandmolds at the second station.
 11. A process as set forth in claim 5wherein the closing of such flasks and the stripping of the sand moldstherefrom is accomplished at such second station.